Comparison of nitrate attenuation characterization methods at the Uranium mill tailing site in Monument Valley, Arizona |
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| Authors: | Kenneth C Carroll Fiona L Jordan Edward P Glenn W Jody Waugh Mark L Brusseau |
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| Institution: | aDepartment of Soil, Water and Environmental Science, University of Arizona, 429 Shantz Building #38, P.O. Box 210038, Tucson, AZ, USA;bDepartment of Hydrology and Water Resources, University of Arizona, Harshbarger Building #11, Tucson, AZ, USA;cGolder Associates Inc., 5200 Pasadena Ave. N.E., Suite C, Albuquerque, NM, USA;dEnvironmental Sciences Laboratory, S.M. Stoller Corporation, Grand Junction, CO, USA |
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| Abstract: | Several methods for characterizing the occurrence and rate of nitrate attenuation were tested at a field site near Monument Valley, Arizona. Spatial and temporal nitrate concentration data collected from a transect of monitoring wells located along the plume centerline were analyzed to evaluate the overall rates of natural attenuation. The occurrence and rate of denitrification was evaluated through microcosm experiments, nitrogen isotopic fractionation analysis, and solute-transport modeling. First-order denitrification-rate coefficients calculated with each method were comparable. In addition, the composite natural attenuation rate coefficient was similar to the denitrification-rate coefficients, which suggests that microbially induced decay primarily controls nitrate attenuation at the site. This research highlights the benefits associated with a multiple-method approach for the characterization of natural attenuation. |
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| Keywords: | Nitrate Natural attenuation Stable isotope Rate coefficient Denitrification |
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